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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Contraception. 2019 Jan 24;99(4):244–250. doi: 10.1016/j.contraception.2018.12.010

Table 2.

Robustness and reliability of our UPLC-MS/MS method.

Sex-Steroid Hormone External QC
(pg/ml)
Measured (mean±SD)
(pg/ml)
# of
Measurements
Time Period RE (%)a CV (%) b
Progesterone 35 34.4±3.8 46 02/25/2015 - 07/07/2016 1.7 11.1
100 103±7.3 18 07/14/2016 - 02/22/2017 3.1 7.1
Estradiol 25 24.5±3.2 61 01/13/2015 - 02/22/2017 2.0 13.0
a

RE=relative error=(calculated value-true value)/true value *100.

b

CV=relative standard deviation=sample standard deviation/sample mean*100.